120 MAGNETIC OBSERVATIONS. 
OBSERV ATIONS— Continued. 
Station, Camp 85, Colorado Chiquito ; latitude 359 18 11". 14 ; longitude Th. 23m. 31. ۰ 
Needle, B. Date, December 17, 1853. Hour of beginning, 4h. 55m. p. m. ; hour of ending, 5h. 20m. p. m. 
Observer, Lieut. J. C. Ives, Topographical Engineers. 
[e] 1 “ 
oe 38 03 
Needle vertical, face of circle north, reading of azimuth circle 38 02 
38 05 
LÀ 
38 405 
Needle vertical, face of circle south, reading of azimuth circle 38 3 
38 03 
Reading of azimuth circle when plane of instrument is in the magnetic meridian 38 03 30 
Reading of azimuth circle when plane of instrument is in the true meridian 51 45 09 
Approximate magnetic declination 13 41 39E. 
OBSERVATIONS FOR MAGNETIC INCLINATION AND INTENSITY—No. 4. 
Def. with wt. 2 gr. Def. with wt. 23 gr. Def. with wt. 3 gr. 
Face of circle. Direct. : 1 
Def. towards | Def from the | Ther. | Def. towards ` Def. from the | Def. towards | Def. from the 
the vertical. vertical. Fah. | the vertical. | the vertical. | the vertical. vertical. 
(1) Bcc» (1) (2) 
o 7 0 , [e] , ° ° , ° , $ o , 
61 47 87 52 35 30 36 94 35 28 15 102 30 20 30 
ANE AA 61 50 87 59 O80 Seuss 94 25 28 28 102 25 20 30 
61 46 87 45 Soe ee map E 94 40 28 27 102 25 20237 
; 61 47 87 45 کت‎ 30. a 94 50 28 20 102 27 20 28 
hor o مو ماب‎ 61 46 87 50 Z5 r. Lies 94 59 28 28 102 30 20 18 
61 43 87 45 35 30 36 94 50 28 20 102 32 20 22 
oe t [e] , rr ° ° 1 7 0 1 
(1) 87 49 20 (1) 94 43 10 (1 102 28 10 | 
Monts دص ا ا‎ mm ] (2) 35 30 00 - (2) 28 23 00 (2) 20 25 50 
. Cor. for index er- M ad 
ror of needle...| 十 8 48 
Deduced inclina- | 9 ^ " 
G _......-.. 61 55 18 
° , ” ° t 7 o 7 "n 
Differences, ---- وخ‎ cw تو‎ ^ Xen 66 20 10 st 02 20 
Half diff. or angles O t A o e " o ' e? 2 
of deflection - M Uu  L»oos 33 10 065 A: wr ` 
o , ۱, ٥ y 11 [e] 7 “a 
Sum of means EM Jb ۵۷ھ۷۹۹‎ 128. 08. .10 I2 B4 DO 
o , Mi o 1 “ ° “ “ 
Half sum — dip 61 39 40 
